SSC General Science & Technology Sample Paper NCERT Sample Paper-1

  • question_answer
    Addition of a trace of thyroxine or iodine in water containing tadpole will................

    A)  Keep them in larval stage

    B)  Hasten their metamorphosis

    C)  Slow down their metamorphosis

    D)  Kill the tadpoles

    Correct Answer: B

    Solution :

    [b] Thyroxine controls tissue differentiation and metamorphosis of tadpole larva into frog. Gundernatch (1912) proved that metamorphosis of tadpole into adult frog is controlled by thyroxine. Addition of thyroxine in water will hasten the metamorphosis.

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